linux-kernel - [PATCH] platform/x86/intel-uncore-freq: Return error on write frequency

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Date:   Tue, 18 Apr 2023 08:32:30 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     hdegoede@...hat.com, markgross@...nel.org
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Wendy Wang <wendy.wang@...el.com>
Subject: [PATCH] platform/x86/intel-uncore-freq: Return error on write frequency

Currently when the uncore_write() returns error, it is silently
ignored. Return error to user space when uncore_write() fails.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Reviewed-by: Zhang Rui <rui.zhang@...el.com>
Tested-by: Wendy Wang <wendy.wang@...el.com>
---
This patch has no dependency on TPMI patches for uncore support.

 .../x86/intel/uncore-frequency/uncore-frequency-common.c    | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c
index cb24de9e97dc..fa8f14c925ec 100644
--- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c
+++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-common.c
@@ -44,14 +44,18 @@ static ssize_t store_min_max_freq_khz(struct uncore_data *data,
 				      int min_max)
 {
 	unsigned int input;
+	int ret;
 
 	if (kstrtouint(buf, 10, &input))
 		return -EINVAL;
 
 	mutex_lock(&uncore_lock);
-	uncore_write(data, input, min_max);
+	ret = uncore_write(data, input, min_max);
 	mutex_unlock(&uncore_lock);
 
+	if (ret)
+		return ret;
+
 	return count;
 }
 
-- 
2.38.1